Head-clamping device



y 23, 1929- w. c. DE ROO ET AL HEAD CLAMPING DEVICE Filed Feb. 21, 1924 rroe/vzy Patented May 28, 19259.

7 rnaszse stares stares ears at err-iris.

WILLIAM C. DE R00, or GINGINNATI, AND mains E. LARSI-I, or eHEvrotaorIro, AS- srenoas TO THE pauses MACHINE TOOL ea, or CINCINNATI, onIo, A ooaroaA- @ION OF OHIO.

EEAD-CLAMPING DEVICE. I

Application filed February 21, 1924. Serial nofeeaa'eo.

Our invention relates to head clamping de vices adapted for use in connection with radial drills. v

Heretotore it has been customary to position the operative handle of head clamping devices adjacent'the top portion 01": the radial drill arm whereby considerable inconvenience is experienced in operating the device. The top portion of the arm ot a radial drill is usuallv inconveniently accessible to the operator oit' the radial drill and sometimes it'is necessary for the operator to stand upon an elevated support for the purpose of grasping the manually operated handle of the head clamping device. Considerable time is, therefore, consumed and wasted by the operator caused'by the usual inconvenient location of the head clampin operative handle. Furthermore, the operator of the radial drill is endangered when reaching upwardly and over moving parts of the mechanism for the purpose of grasping and operatlng the handle of the head clamping devlce.

The objects of our invention are to provide mechanism whereby the operating lever of a head clamping device. is conveniently positioned for manual operation by the operator of the radial drill; to provide ,a head clamping device having an operating lever osi-v tioned adjacent the lower edge of the rad al drill arm and'in close proximity to the radial drill spindle whereby both the head clampoperating lever and the spindle may each be operated withoutundue loss of time by the operator when desiring to operate both devices insequenee. p

' Our invention consists in providing a man ually operatedlever fixed to a vertical rod iournaled in supports integral with the radial drill arm and having the upper end of said rod fixed to a horizontal rockable lever having a horizontal plate pivotally connected thereto and actuating means for a plurality of tightening screws comprising a plurality of crank arms pivotally connected to said plate and each of said crank arms having a tightening screw fixed in one end thereof and said screws threaded and projecting through a portion of said head adjacent said arm and adapted to force a gib in close contact with the upper edge of the top rail of said arm when said lever is actuated.

Our invention also consists in the construe-- tion, combination and arrangement of parts as herein set forth and claimed.

In the drawing: I

Fig. 1 is afront elevation of a radial drill showing thechead partly broken away and hav ng our invention attached thereto;

F 1g. 2 1s a perspective View of our invention shown in enlarged form and having lng. around the column; Eccentric clamps 8', I

mounted thereon as end 7 forming ajbear respectively, actuated by manually operated levers 9 provide clamping means for securing arm 6 in vertically adjusted positions on the column. 7

The arm 6 has integral upper and lower rails 10 and 11, respectively, extending longitudinally thereof. The upper rail 10 slidably supports drill head 12 having suitably SQ". cured therein vertical spindle 13 for receiving 001 14 in the lower end thereof. 7 i

The'head 12 is provided with longitudinal support 15 having integral flange 16 extending downwardly and engaging the outer edge of upper rail 10 whereby the top portion of the head is maintained against outward movementrelative to arm 6. A gib17 is disposed intermediate support 115 and upper rail 10 engaging the top surface thereof andadapted to travel with head 12. The bottom or" lower rail 11 is provided with a downwardly extending angular surface1 8 adapted to engage upwardly extending angular surface 19 of integral longitudinal suppoit 20 of head 12, whereby the lower portion 0]": the head; is maintained against outward movement relative to arm 6.

Manually operated means for sliding head 12 overrail 1.0 longitudinally of arm 6, there by imparting lateral movement to the head relative to column 3, comprises manually operated hand wheel 21 fixed to shaft rotatable inbearing 22' and 22" in head 12, and having pinion 23 fixed thereto and meshed with rack 24 fixed to the bottom of upper rail and extending longitudinally thereof.

For' use in combination with'the afore:

described usual mechanism which may compositioned at its front inner corner thereof. A manually operated hand lever 28 positioned prise a radial drill we provide means for clamping head 12 against longitudinal movement relative to arm 6. Our preferred mechanism comprises vertical rod 25 extending transversely of armti and rotatably secured in bosses 26 and 27 integral with head 1.2 and near the lower edge of arm (land in close proxin'iity to spindle 13 1s fixed to the lower end of rod 25 and in engagement with the.

bottom of boss 27 by pin 29. A roclrable arm 3 fixed by pin 31 to the upper end of rod" 25 and in engag ment with the top of boss 26 adjacent the upper edge of arm 6. The rockable arm has slot 32 in its outer end for re-' ener screw 41 having right hand thread 42 cut on itslower portion, and circumferential shoulder 43 adjacentthe upper part ofthe thread. Shoulder 43 is adapted to engage the. lower side of tightener crank arm 37 thereby maintaining top 44 of screw 41 substantially flush with the top of tightener crank arm 37 Thetightenerscrews 41 are l vertically threaded to support 15 which'is less in thickness thanthelength of threaded portion 42 of the screws thereby permitting the lower ends of the screws to project'through the support in engagement with gib 17 whereby right hand direction of rotation of the screws causethe gib to closely engage the top surface of upper rail 10 thereby causing angular surface 19 of support 20 to engage angular surface 18 of lower rail 11 for thepurpose of locking head 12 against lateral movement on arm 6.

. The operation of the mechanism of our invention in combination with the mechanism which comprise a usual radial drilling machine is as follows:

Manually. operated lever 28 positioned in .close proximity .to spindle 13 and near the lower edge of arm 6 is pulled outwardly whereby vertical rod rotatably mounted in bosses 26 and 27 and having its lower end fixed 'to lever 28by pin 29 and having its upper end fixed to rockable arm 30 by pin 31 causes slotted outerend 32 of rockable arm 30 to move outwardly relative to column 3'. Outward lateral movement is thereby imparted to horizontal bar 34 having end 33 pivotallyconnected to rockable arm 30 in slot 32; the horizontal bar in turn imparts outward motion to ends 37 of spaced apart tightener crank arms37 having slots 36 for receiving horizontal bar 34 and pivotally-connected thereto by pins 38. Each end 37 of the tightener crank arm, having hexagon hole 39 ther in and receiving hexagon end 4O of tightener screws 41 is thereby rotated causingv threaded portion 42, screwed in support 15 integral with head 12, to move dowi'iwardly to contact with gib 17 thereby forcing thegib in close contact with the upper surface of upper rail 10 and causing angular surface 19 of support 20 of head 12 to closely engage angular surface 18 of lower rail 11, whereby head 12 is locked against lateral movement on arm 6. p 7

The combination mechanism of the radial drill for axially and laterally positioning drill 14 fix din spindle 13 comprises usual lever 5 rotatably mounted in column support 2 and provided with eccentric means 4 whereby drilling arm 6 is permitted to revolve around column 3. The usual manually operated hand wheel 21 is then rotated in direction corresponding to the desired lateral movement of drill 14 whereby the combination mechanism which permits arm 6 to revolve around column 3 andwhichpermits so i lateral movement of head 12on arm 6 enables the operator of the radial drillto position the drill laterally with relation to any portion of the work being done. The usual lever 5 is then actuated for securing arm 6 against revolving movement around column 3 and manually operated lever 28 is pulled outwardly causing gib 17 to closely engage the upper surfaceof rail 10 thereby forcing angular surface 19 downwardly and in locking engagement with angular surface 18 whereby head. 12 is locked against lateral movement on arm 6. The drill 14 is now securely loclred in position in spindle nose 13 for drilling vertical hole at a desired axial location in the work usually supported by base 1. For axial adjustnient of drill 14 levers 9 or other usual mechanism (not shown) are then actuated whereby eccentric clamps 8 or other mechanism permits vertical movement of spindle nose 13 thereby pernitting drill 14 to be lowered near engagement with the object positioned on base 1. The drill 14 is now further positionedlaterally and axially for fine adjustments with reference to the work and the usual mechanism forv rotating the drill may be actuated.

e have, therefore, provided an extremely simple, efi'lcient, economical and practical device whereby the head of a radialdrill may be securely locked against lateral movement upon the arm of the radial drilling machine lever of the head clamping mechanism near the lower edge of arm 6 we have not only pro vided an extremely convenient operatable position for the lever but we have also mini;- mized chances of injury'to the radial drill I operator caused byaccidental contact of his hands and arms with parts of the mechanism comprising the drilling arm and head secured thereto. I L

In the past when operating the head clamping lever, usually positioned near the top of arnrG, it has not been unusualtl'or the radial drill operator to find it necessary to stand upon a support placed upon base 1 for grasping the lever when radial drill arm bearing 7 is positioned adjacent the top of column 3.

In brief, the operation of the manually operate'd head clamping lever embodying our invention will greatly simplify the operation of clamping the head against lateral movement on the radial drill arm since it positions the head clamping lever in a conveniently accessible location relative to the radial drill operator and dispenses with the necessity of the operator standing upon the base of the *adial' drill or support placed thereon and reaching over parts of the radial drill mechanism for the purpose of operating the head clamping mechanism. v

While we have shown and described our novel head clamping mechanism as adapted and intended for a particular type of machine it may also be used in any other situation to which it is adapted and while we have shown and described a particular construction of mechanism it will be understood that it may be varied in construction and arrangement such as may be necessary for its use in combination with radial drilling machines'having a drilling arm and a drilling head attached thereto in varied constructions of form without departing from the scope or spirit thereof as defined in the claims.

lVhat we claim as new and desire to secure by Letters Patent is: g i

1. In combination with a radial drill having a head, an arm and a spindle, a horizontal upper rail and a horizontal lower rail integral with said arm, said lower rail having an angular surface on the bottom thereof, a horizontal upper support integral with said head and having a plurality of spaced apart threaded vertical holes therein a horizontal lower support integral with said head and having an angular surface on the top portion thereof adapted to engage said angular surface of SaICl'lOWQI rail, spaced apart bosses integral with said head and positioned on the front inner corner thereof and havmg ertical holes therein, a vertical rod rotatably receivedinsaid holes, 'a manually operated hand lever secured to the lower end of said rod near the lower edge of said arm andin close proximity to said spindle, a rockable lever fixed to the upper end of said rod and having a horizontal slot in one end therej of, an outwardly extending horizontal bar having its inner end pivoted to said roclrable arm in said slot, a plurality of spaced apart 1 and'horiz'ontally extending crank arms, each having a blfurcated end, said crankarins pivot-ally connected to said "horizontal bar and each'of said crank "arms havinioa .ver-

tical hexagon hole in the other end thereof,

a tightening screw having hexagon end received in each of said hexagon holes and having thelower ends threadecha circum ferential cellar intermediate said hexagon end and said threaded endandadapted to engage the lower side ofsaid crank arm, agib intermediate said upper support and said upper rail and adapted to be moved by said screws in contact therewith to closely engage threaded vertical holes therein, a horizontal I lower support on said head and having an angular surface'in the top portion thereof and adapted to engage said angular surface of said lower ra1l, spaced apart bosses on said head posltioned 1n the front inner corner thereof and having vertical holes therein, a

vertical rod rotatably r ceived in said holes, a manuallyroperated hand lever secured to zontal bar pivoted to said rockable arm, a plurality of spaced apart crank arms pivotally connected to said horizontal bar, a tightening screw connected to each of said crank arms and having its lower 1, end threaded through apart of said head, a gib intermediate said upper support and said upper rail and adapted to be moved by said screws in contact therewith to closely engage the top surface of said upperrail when said lever is pulled outwardly whereby said angular surface of said lower rail is adapted to closely engage said angular surface of said lower support. v I

3. In a radial drill having an arm and a head slidably mounted upon said arm, the combination of a locking device whereby said head is locked in any desired adjusted posithe lower end of said rod, a rockable leverfixed to the upper end of said rod, a hori-- tion against horizontal movement upon said arm and which comprises a vertical rod rota-tably supported by said head, a hand lever rigidly secured to said rod, a rockable arm rigidly fixed to said rod, a bar pivoted to said rockable arm, a gib mounted between said headand said first-mentioned arm, a

plurality of crank-arms pivotally connected to said bar, a tightening screw connected to each of said crank-arms and mounted in said head and in engagementwith said gib whereby inovement'of said hand lever to rota-te said rod is adapted to closely engage said head upon saidarm through. said gib to firmly'hold said head in horizontal adjusted position upon said first-mentioned arm. i 4. In combination with a radial drill having an arm' and a head slidably mounted on said arm, a horizontal upper red on said arm having a longitudinal upper surface, a

horizontal lower rail on said arm having a longitudinal lower surface, a horizontal uppersupport on said head and having a plurality of spaced apart threaded vertical holes therethrough, a horizontal lower support on said head and having a'holding surface adapted to slidably engage the longitudinal lower surface of said lower rail, a vertical rod rotatabl su orted b said head and having ahand leverthereon, a rockable arm fixed to said rod, a horizontal bar pivoted to said rockable arm, a plurality of crankarms pivotally connected to said bar, a tightening screw connected to each of said crankarms and each having its lower threaded end tion desired. I

WVILLIAM C. DE BOO. JAMES E. LARSH. 

